Johnny and Wyatt follow Lockjaw through space as they find a way to earn his trust so that Lockjaw will take them inside the Negative Zone. Meanwhile, the remaining Fantastic Four come under attack by Klaw, who is now pure sound energy.

Klaw gets the upper hand as Reed allows Ben to fight a holding action to buy Reed the time he needs to get a weapon from a distant friend. The Black Panther sends two bands of Vibranium that absorbs Klaw's sonic energy and helps the FF to defeat Klaw.